From what has been described to me by the service dept, the compressor fails and opens the system to the outside. This contaminates the expansion valve and the condenser which also has the receiver drier. The compressor failures apparently are well documented. The same parts are used on all Mustangs. You would expect Ford to be aware of the situation and at least have a good supply of replacement parts available for the a/c season. I am faced with a 500 mile drive home into some of the warmest and most humid conditions on the east coast. Then, I may have the privilege of waiting the 6-7 weeks for the parts to be available. Fortunately, I will have a more reliable car available when we get home. It is just so disappointing in this day in age to have to wait to fix things that shouldn't break.